The blue box that Elfangor used to create the Animorphs has been found by a kid named David. David has no idea what he has — or what it can do. But Marco does. And when he sees David with it, he knows the Animorphs have to get that box — at any cost.<br /> <br /> But what should have been a simple plan ends up going horribly wrong. And David is on the run with the Animorphs and Ax. Now they have only two choices: turn David over to the Yeerks — or make him the sixth Animorph.